Justification:Halophila beccarii has an Indo-Pacific distribution which is patchy and fragmented. The global population trends indicate this species is declining, although it is fast-growing and may recover quickly from disturbance. However, it also has a narrow, restricted depth range right at the intertidal zone which is an area where there is a lot of anthropogenic disturbance. Due to its specific habitat requirements and narrow depth range, its area of occupancy is estimated to be less than 2,000 km². Major threats include storms, coastal development, habitat destruction, mining and dredging, mechanical damage from boats of boats, pollution, sedimentation and aquaculture. There is a continuing decline in habitat quality and population fluctuations due to these threats. This species is listed as Vulnerable under criterion B2.

Halophila beccarii has a disjunct and fragmented distribution in the Indo-Pacific. In the Pacific, it is found from southern China to Singapore, Sarawak (Malaysia), and the northwestern Philippines. In the Indian Ocean, it occurs from Malaysia, throughout the Bay of Bengal and along the west coast of India.

Halophila beccarii is common in intertidal areas in Bangladesh and India. It is common in seaward mangroves and lagoons in Malaysia and Thailand and in mud flats and seaward mangrove areas in China. The population is thought to be stable in Thailand. It is also stable in India, and in some places is increasing. The population is decreasing in Malaysia due to competition with Halodule pinifolia and habitat loss from mangrove destruction and coastal development.

Halophila beccarii is found in the upper intertidal zone and grows on mud or muddy sand substrates in estuarine and coastal areas. This species is fast-growing with large seed production. It is a colonizing species. This species flowers year round and has annual and perennial populations in Malaysia and Bangladesh. In India, it acts as a pioneer species in the succession process leading to mangrove formation.

This species has a narrow, restricted depth range right at the intertidal zone. It has a wide salinity tolerance (euryhaline) and can recover quickly from disturbance, such as increased sedimentation.

This species is one of two in the oldest lineage of seagrasses, and therefore has a high evolutionary value (i.e., living dinosaur).

Halophila beccarii is susceptible to a number of threats due to its very narrow restricted habitat in the intertidal zone.

Major threats to Halophila beccarii include destruction from cyclones, waves, intense grazing and infestation of fungi and epiphytes. Other threats include mangrove destruction, coastal development such as construction of harbours or jetties, ponds for shrimp farming, mining (Philippines, Thailand and Malaysia), sand dredging for landfills and anchoring and moving of boats, discharge of sediments, untreated sewage disposal, and aquaculture.

Areas where this species occurs are often rich in molluscs, thus this species can be threatened during mollusc harvesting, and other types of harvesting that use pull-nets.